Blog #4 - energy transformation

        An activity i do that converts into energy is eating! When I eat food my body can produce mechanical energy for when i need to use my muscles. Food is converted into carbohydrates, or glucose, it flows throughout the bloodstream, cells absorb the food and then it is used to fuel the body.












TEST QUESTIONS:  ENERGY
















1.  What is the speed of an object if it has the mass of 3.46 kg and a kinetic energy of 274.9 J?

Uk = (1/2)mv^2

 A:  12.61 m/s




2. A 30 kg child climbs 15 meters up a tree. When he stops to have a look around, what is the
child’s potential energy?







A: 4410 J




3.  What are 3 different types of energy?

A:
Potential Energy
Kinetic Energy
Gravitational Energy
Spring Energy

Week 3- going green :)

I really do not know much about these topics but I do know a little bit.


I have heard the term "going green" referring to people trying to use resources like water and electricity and keeping in mind the environment when they use them.









I know that the United States uses the most oil out of anyone because we use it for many different things such as cars, other ways of transportation and also machinery.







Coal is used to power things like heaters and is used to make iron and steel.








I really don't know much about nuclear power other then it is a source of electricity. 








Hydrogen fuel converts water into energy and is used to power hydrogen cell cars.





 Energy efficiency is using less energy to provide the same level of energy like using solar panels for electricity or putting in house insulation to keep your house warmer with out having to turn on heaters.







Test Questions:

1. How much work is done by a force of 6.32 N that operates over a displacement of 3.65 m?

A:  23.07J




2. What are renewable and nonrenewable resources?

A:  Renewable energy is energy generated from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable (naturally replenished).

Nonrenewable resource is  an energy source that is replenished very slow or is not replenished at all by a natural process.



3. An elevator must lift 1000 kg a distance of 100 m at a velocity of 4 m/s. What is the average power the elevator exerts during this trip?

A:    3.9×10⁴ Watts or 39 kW.

week 1

When i am dancing i jump, stand still and move from side to side.

Standing still

  Jumping!

Moving side to side!

Test Questions:

1. Draw a free body diagram of a parachutist who has just stepped out of the airplane, and is accelerating toward the ground.

A:

                                   Fg > Ff






2. I am moving but don't want to stop what Newton's law am I?

A: I am Newton's Law of inertia (Law 1), it states objects stay at rest stay at rest unless acted on by an external force.


3. If forces are in opposite directions how do you find the direction of the force? What about in the opposite direction?

A: If forces are going in the same direction you add the forces together and if the forces are opposite directions you subtract the forces.

Week 2

•          When I rides like the gravity rides i feel very heavy because it is exerting positive G's on you which pin's you down to the wall. Yes an object can be weightless when it is in free fall because you are always falling to the strongest gravitational force. An object is weightless when no gravity is acting upon the object.

Test Questions:


1. NLUG


Conceptual:   What does Newton's Law prove to use about any 2 objects?

A: NLUG says that any 2 objects have a gravitational force.


 2. NLUG

 Calculation:
 Determine the force of gravitational attraction between the earth (m = 5.98 x 10²⁴ kg) and a 70-kg physics student if the student is standing at sea level, a distance of 6.38 x 10⁶ m from earth's center?

 

 3.

week 7

         I think the hardest thing for me to do in physics is the calculations. It is hardest because when i read the questions i sometimes do not read everything correctly and then some of my data is incorrect. If i start reading it more thoroughly  i will fix this mistake. I also think it would help by using the GUESS method ALL the time and just not some of the time it would make things less confusing and more organized. Independently i can do the reviews and see what i am messing up on repeatedly and fix my mistakes. When working in groups i could have everyone do a problem and then we could compare answers ensuring that everyone understands how to work out the problems. In class with my teacher i could ask for help when i do not understand and i could also pay more attention and spend less time staring off in to space and doing other things while he is teaching.







Test Questions:


1. An airplane accelerates down a runway at 3.20 m/s² for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

A: d= 1720m



2.  You are looking up at the top of a tree that is 10 m apart from you. If the tree is 15 m taller than you, at what angle are you looking upward?

 A:    56.3 degrees








3. What is the final velocity of a car that accelerated 10 m/s² from rest and traveled 180m?


A: 60m/s






The paragraph i just wrote is about my problems and how i am going to fix them.

Week 4

 Something that has zero acceleration would be when a car moves at a constant speed and never slows down or stops. Velocity is how fast something goes in a certain direction. Acceleration is a change in velocity so an example of something with zero velocity would be a car racing on a drag strip. The car has to accelerate fast to start of with then it has to decelerate quickly when it comes to the end of te track.



Test Questions:

1. if a car moves from the rest to 5 m/s in 5 seconds, its average acceleration is..

A: 1m/s



2. What is the final velocity of a car that accelerated 10 m/s² from rest and traveled 180m?




3. What is the deference between velocity and acceleration?

A:  Velocity is quickness or speed of motion and acceleration is the rate of the change of velocity with respect to time.

Week 2

       Acceleration is used a lot in our daily lives, but the things that stick out in my mind most are cars because they are always stop and go or slow down and speed up. When I watch car races they use acceleration a lot. The cars have to decrease their acceleration when they go around corners and then increase acceleration on the straight a ways.The car's speed is not always constant therefore the race cars use acceleration.





Test Questions:

1. What is the acceleration formula?
A:   a = vf-vi
                t


2. Name two things you use everyday that have an accelerometer in them?
A: itouch or an airplane

3. If an object is moving at constant speed what is its acceleration?
A: the acceleration is zero because acceleration is defined as the change in speed.





I pretty much understand the just of how acceleration works i just think i need to spend a little more time practicing solving problems so i get a better understanding of how to solve them.